Abstract

The residual effect of five insecticides on Plutella xylostella (L) larvae was measured on Brassica
rapa in the laboratory. Acephate was the most persistent and gave at least 80% larval mortality eight
days after application. Bendiocarb, Bacillus thuringiensis, and methamidophos gave 50% larval mortality
six days after treatment. Di[lubenzuron demonstrated poor insecticidal activity - the larval mortality
was 20% at all times